Abstract
A chemical graph is a molecular complex that significantly explains the molecular structres. In this way atoms are identified by vertices and that are connected by lines known as edges of graph. Triangular benzenoids and starphene nanotubes are an inorganic compound with trigonal crystal system. We have computed the degree-based topological co-indices of triangular benzenoids and starphene nanotubes, that are successfully linked with its thermodynamic properties.